Shell fob bock dbills



June 26, 1928. I 1,674,816

L. c. BAYLES SHELL FOR ROCK DRILLS Filed Feb. 5, 1927 INVENTOR.

lie/u? (-16 0? led.

BY z/ W HIS ATTOR EY.

Patented June 26, 1928.

UNITED "STATES PATENT OFFICE.

LEwIs c. BAYIiES, oE as'roN, PENNSYLVANIA, ASSIGNOR TO INGER-soLL-RAnD com- PANY, OF JERSEY crrY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SHELL EoR ROCK DRILLS.

Application filed February 3, 1927. Serial No. 165,595.

This invention relates to cradles or shells of the type used for supporting and guiding rock drIll'SWith respect to the work. More particularly, the invention relates to the feed screw which is operatively connected to the rock drill and the shell for actuating the rock drill longitudinally of the shell, both to advance the drill toward the work in accordance with the penetration of the drill steel into the work and to withdraw the drill steel from the drill hole.

In apparatus of this type it is customary touse a feed screw of considerably greater length than the shell body. This is done toobtain the required travel of the rock drill and at the same time to hold the weight of the shell'to a minimum. In consequence of this construction, aconsiderable portion of the feed screw overhangsthe shell body at one end. In-order to support this overhangingend of the :feedscrew, a cross head is provided to rotatably receive the feed screw and the cross head is secured to the shell bodyby means ofside rods or bolts.

Usually,;the.-bolts arecpassed through two or more ribs on the sides of the shell-and spacers-in the form of sleeves are placed on thebolts-to abut with one end the cross head and with the other end the shellbody. In vthis way the cross head, and the spacers are clamped in operative position. While this construction will have the effect of clamping the-overhanging elements to the shell body, it does not, however,iprevent an objectionable whipping OI;VlbI&t0Iy movement of the overhanging elementsdue to the vibration of the rock drill, particularly when the drill occupies a position near the opposite end of the shell.

r The. present invention. aims to eliminate this-whipping actionof the overhanging portion of the feed screw and also to prevent any distortion of the, shell body due to the clamping eifectiof the side bolts or rods.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of=elements-.'and arrangement'of parts having the general mode-of operation substantially as. hereinafter described and claimed and illustrated in the accompanying draw ings, in which Figure 1 is a longitudinal side view of a rock drill shell having the invention ap-' plied thereto.

Figure 2 is an enlarged view partly in section taken through Figure l on the line 2 2 looking in the direction of the arrows,

Figure 3 is an elevation partly in section taken through .Figure 2 on the line 33 looking in the direction of the arrows, and

Figure 4 is a view similar to Figure 3 illustrating a. modification of the invention.

Referring to the drawings, A designates a shell body having an intermediateconical bearing portion B whereby said shell body may be anchored to a column or-other suitable device (not shown) forsupporting the shell with respect to the work. The shell A is provided with the usual guidewa ys C to receive slidably guides D carried by the cylinder E of the rock drill F. The'rock drill illustrated is of the drifter type and supports at its front end, a drill steel G against which the blows of the hammer piston (not shown) may be delivered.

In common with drills of this type, the cylinder E carries near its rearward end a lug H Which extends into the shell-A "and is bored to receivea feed nut-J vwhichlnay be fixedly secured in the lug H in any suitable manner.

The feed nut J is interiorly threaded to cooperate with a feed screw K for actuating the rock drill F longitudinally of the shell A, that is, to advancethe rock dlllltLS the drill steel G penetrates the work and also to withdraw the :rock drill together with the drill steel from the work after the hole has been drilled.

The feed screw K is preferably anchored rotatably at its. front end' in a bearing L secured to the front end of the shellA by means of bolts 0. In the presentinstance the feed screw K is of such length that a considerable portion thereof extends beyond the rearward end of the shell A, thus enabling the rock drill F to be retracted a suflicient distance to permit withdrawal of the drill steel G out of the drill hole.

In order to form a support for the overhanging portion of the feed screw K a cross head P is disposed on the rearward end thereof to receive rotatably the feed screw K and also acts as. an abutment for a lateral. flange Q on the feed screw for prewenting relative longitudinal movement between the feed screw and the cross head in one direction. To prevent such movement between the feed screw and the cross head in the opposite direction, a crank handle R disposed on the end of the feed screw bears against the rearward end of the. cross head; P. The crank handle R may be of any suitable type and in the present instance is clamped on. the feed screw K by means of a: bolt S. This crank handle R. allords a convenient means: ton rotating the feedl screw K to actuate the rock drill F in the shell A- .According to the present invention the shell A is, provided at its rearward end and on opposite sides thereot with T and U. The lugs '1 are; preferably formed at the immediate end of the shell and the lugs U or innermost lugs are preferably spaced a slight distance therefrom. and in alhgnnient with the lugs T. The lugs '1 are provided with apertures V to receive sleeves W which extend therethrough and into: recesses X intlie lugs. U. The recesses X are preferably shallow and: the bottoms thereof form an. abutment for" one end oil the sleeves Apertures Y form a continuation of there cesses X to) enable bolts. Z to extend there-- through, said bolts extending. beyond the lugs: U to receive nuts b which bear against the ends of the lugs U.

The opposite ends of the bolts Z are this instance also threaded: and project. through luigs: oil? the cross head P ilor sup-- porting said cross head, nuts b: being provided for" clamping the cross head securely in position The sleevesVV are of such; length as to. abut with their" rearward endstheforward. or inner face of the cross head P so that when the nuts Zr are screwed on the bolts Z the cross head P and the sleeves W will be drawn firmly into: operative position.

The sleeves W are prelleraibly so. bored that they will fit snugly the bolts Z, thus having the effect of imparting rigidity to said bolts. and consequently preventing ex cessive vibration of the feed screw K. In the present instance the sleeves W also: fit snugly the apertures V and; the recesses X in the 'lug-s T and U respectively so that when the sleeves: W are pressed or driven into the lugs, the sleeves: will be sligllitly con tirascted to produce a clamping eflect at these points on the bolts Z. In this way is: formed a; rigid construction: whereby the objects of the inve tionare attained.

Besides eliminating vibration of the feed screw, the present invention also prevents distortion of the shell body. This is due to the fact that both the spacers and the clamping nuts act only on a single lug on each side of the. shell, as a result of this, any distortion which may occur will take plaiceaoz'ily in the lug to which the bolts and spacers are anchored and not in the shell body as has previously been the case where the spacers were abutted against the end of the shell and the nuts. acted against a rib or lug spaced from the end of the shell.

In the modification illustrated in Figure 4 lugs 03 are formed only at the rearward end of the she-ll A. and on. the opposite sides thereoli. These: lugsdzare provided with tapered apertures a to receive a taperedendf of sleeves. 9.. The; sleeves. 9 maybe: re liev'ed intermediate: their ends as at. kso that, the said. sleeves contact only with the bolts:

Z at their front end, E y-thus; tapering the ends ot the sleeves g, as well as the? apertures 6, the sleeves, gr may be; firmliy drawninto the;

lugscl by the: nuts: 12 without. thisaidl on: special appliances iior: this; purpose, and any wear which. may occur between the; cooperating surfaces of. the sleeves g andl theylzugs (i may be readily compensated 01" lay: merely tiigh-tening up the nuts I). This; constnuction also enables the feed: screw supporting elements to) be readily disassembled 01: the. purpose of inspection on replacement Lt wilt be: observed that in this maoelaificr tion the sleeves. g and the nuts 6 mlscnhothx act againstthe some lugs; so that. any disrtortion which. may take place. will; be: only in the lugs and. not affect the body portion) 045 the shell. This. is an advantageous teature shells ozli' this: type, since it prevents any binding efiiect of the shell on the guides of the cylinder-and therefore: pewtects. these parts against wear due: to: such binding- It to be understood that the present showing and description discloses only a few SIOBClfKiCl nwdlificatiions of my invention and that the invention is: capable of; further modification Without departing from the spirit thereof or the scopeof the claims.

I claim: I

1. A. shell tom guiding a; rock-dnillg comprising a shell body', hollow l ugs on-opposite sides of the shell body,bolts the hugs extending rearwardly of the shell bad ya cross head supported by the bolts, sleeves on: the bolts holding thev crosslread in spaced relation: with: respect to the shell bod-y said sleeves extending into the lugs, and nuts on the bolts bearing against the same lugs into which the sleeves extend to prevent distor tion of the shell body- 2. A. shell for guiding a rock drill; com.- prising a shell body, a-paim oi legs on each. side of the shell bodly spaced with respect to each other and having apertures therenuts on the bolts holding the parts securely through, bolts extending through the lugs, in operative position, said nuts also seata cross head on the outer ends of the bolts, ing against the innermost lugs to prevent 10 a feed screw supported at one end by the distortion of the shell body.

5 cross head, sleeves on the bolts extending In testimony whereof I have signed this through the outermost lugs and seated with specification. their inner ends in the innermost lugs, and LEWIS C. BAYLES. 

